Observatory submissions don't use browser's SOCKS proxy settings

When I set a SOCKS proxy for my browser to browse over an SSH tunnel, I found that HTTPS Everywhere was still trying to make direct (non-proxied) connections to observatory6.eff.org to submit its certificate observations. This is potentially bad from a privacy point of view and might also cause the observations to be easier for a network adversary to block, because it's very clear where they're headed.

The Observatory submissions should probably respect the browser's proxy settings.